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Why are accreting T Tauri stars less luminous in X-rays than non-accretors?

Published online by Cambridge University Press:  01 May 2007

S. G. Gregory ,
K. Wood  and
M. Jardine
S. G. Gregory
Affiliation:
SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, KY16 9SS, UK email: sg64@st-andrews.ac.uk
K. Wood
Affiliation:
SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, KY16 9SS, UK email: sg64@st-andrews.ac.uk
M. Jardine
Affiliation:
SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, KY16 9SS, UK email: sg64@st-andrews.ac.uk
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Abstract

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Accreting T Tauri stars are observed to be less luminous in X-rays than non-accretors, an effect that has been detected in various star forming regions. To explain this we have combined, for the first time, a radiative transfer code with an accretion model that considers magnetic fields extrapolated from surface magnetograms obtained from Zeeman-Doppler imaging. Such fields consist of compact magnetic regions close to the stellar surface, with extended field lines interacting with the disk. We study the propagation of coronal X-rays through the magnetosphere and demonstrate that they are strongly absorbed by the dense gas in accretion columns.

Keywords

Radiative transferstars: coronaestars: magnetic fieldsstars: pre–main-sequencestars: activitystars: formationX-rays: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S243: Star-Disk Interaction in Young Stars , May 2007 , pp. 163 - 170
Copyright
Copyright © International Astronomical Union 2007

References

Briggs, K.R., Güdel, M., Telleschi, A., Preibisch, T., Stelzer, B., Bouvier, J., Rebull, L., Audard, M., Scelsi, L., Micela, G., Grosso, N., Palla, F. 2007, A&A 468, 413Google Scholar
Donati, J.-F., Jardine, M., Gregory, S.G., Petit, P., Bouvier, J., Dougados, C., Ménard, F., Cameron, A.C., Harries, T.J., Jeffers, S.V., Paletou, F. 2007, MNRAS submittedGoogle Scholar
Donati, J.-F., Cameron, A.C., Semel, M., Hussain, G.A.J., Petit, P., Carter, B.D., Marsden, S.C., Mengel, M., LópezAriste, A. Ariste, A., Jeffers, S.V., Rees, D.E. 2003, MNRAS 345, 1145Google Scholar
Favata, F., Flaccomio, E., Reale, F., Micela, G., Sciortino, S., Shang, H., Stassun, K.G., Feigelson, E.D. 2005, ApJS 160, 469CrossRefGoogle Scholar
Feigelson, E.D., Gaffney, J.A. III, Garmire, G., Hillenbrand, L.A., Townsley, L. 2003, ApJ 584, 911CrossRefGoogle Scholar
Flaccomio, E., Damiani, F., Micela, G., Sciortino, S., Harnden, F.R. Jr., Murray, S.S., Wolk, S.J. 2003b, ApJ 582, 382Google Scholar
Flaccomio, E., Damiani, F., Micela, G., Sciortino, S., Harnden, F.R. Jr., Murray, S.S., Wolk, S.J. 2003c, ApJ 582, 398Google Scholar
Flaccomio, E., Micela, G. & Sciortino, S. 2003a, A&A 397, 611Google Scholar
Flaccomio, E., Micela, G. & Sciortino, S. 2006, A&A 455, 903Google Scholar
Getman, K.V., Flaccomio, E., Broos, P.S., Grosso, N., Tsujimoto, M., Townsley, L., Garmire, G.P., Kastner, J., Li, J., Harnden, F.R. Jr., Wolk, S., Murray, S.S., Lada, C.J., Muench, A.A., McCaughrean, M.J., Meeus, G., Damiani, F., Micela, G., Sciortino, S., Bally, J., Hillenbrand, L.A., Herbst, W., Preibisch, T., Feigelson, E.D. 2005, ApJS 160, 319Google Scholar
Gregory, S.G., Jardine, M., Cameron, A.C., Donati, J.-F. 2006b, MNRAS 373, 827CrossRefGoogle Scholar
Gregory, S.G., Jardine, M., Simpson, I., Donati, J.-F. 2006a, MNRAS 371, 999Google Scholar
Gregory, S.G., Wood, K. & Jardine, M. 2007, MNRAS in press (astro-ph/0704.2958)Google Scholar
Güdel, M., Briggs, K.R., Arzner, K., Audard, M., Bouvier, J., Feigelson, E.D., Franciosini, E., Glauser, A., Grosso, N., Micela, G., Monin, J.-L., Montmerle, T., Padgett, D.L., Palla, F., Pillitteri, I., Rebull, L., Scelsi, L., Silva, B., Skinner, S.L., Stelzer, B., Telleschi, A. 2007a, A&A 468, 353Google Scholar
Güdel, M., Telleschi, A., Audard, M., Skinner, S.L., Briggs, K.R., Palla, F., Dougados, C. 2007b, A&A 468, 515Google Scholar
Günther, H.M., Schmitt, J.H.M.M., Robrade, J., Liefke, C. 2007, A&A 466, 1111Google Scholar
Jardine, M., Cameron, A.C., Donati, J.-F., Gregory, S.G., Wood, K. 2006, MNRAS 367, 917Google Scholar
Jardine, M., Wood, K., Cameron, A.C., Donati, J.-F., Mackay, D.H. 2002, MNRAS 336, 1364CrossRefGoogle Scholar
Königl, A. 1991, ApJ (Letters) 370, L39Google Scholar
Krolik, J. H. & Kallman, T.R. 1984, ApJ 286, 366Google Scholar
Matt, S. & Pudritz, R.E. 2005, MNRAS 356, 167CrossRefGoogle Scholar
Muzerolle, J., Calvet, N. & Hartmann, L. 2001, ApJ 550, 944CrossRefGoogle Scholar
Preibisch, T., Kim, Y.-C., Favata, F., Feigelson, E.D., Flaccomio, E., Getman, K., Micela, G., Sciortino, S., Stassun, K., Stelzer, B., Zinnecker, H. 2005, ApJS 160, 401CrossRefGoogle Scholar
Stassun, K.G., Ardila, D.R., Barsony, M., Basri, G., Mathieu, R.D. 2004, AJ 127, 3537Google Scholar
Stelzer, B. & Neuhäuser, R. 2001, A&A 377, 538Google Scholar
Telleschi, A., Güdel, M., Briggs, K.R., Audard, M., Palla, F. 2007a, A&A 468, 425Google Scholar
Telleschi, A., Güdel, M., Briggs, K.R., Audard, M., Scelsi, L. 2007b, A&A 468, 443Google Scholar
Valenti, J.A. & Johns-Krull, C.M. 2004, Ap&SS 292, 619Google Scholar
Whitney, B.A., Wood, K., Bjorkman, J.E. & Wolff, M.J. 2003, ApJ 591, 1049CrossRefGoogle Scholar